# 内容限定：标识符命名中只能出现英文，中文，数字，下划线。注意：不能用数字开头
# 错误代码示范：1_name = "张三"
# 错误代码示例：name_! = "张三"
name_ = "张三"
name_1 = "张三"

# 大小写敏感
HZH = "帅哥"
hzh = "靓仔"
print(HZH)
print(hzh)

# 不可使用关键字
# 错误的示例，使用了关键字：class = 1
# 错误的示例：def = 1
Class = 1
Def = 1